Bose 901 Series III User Manual download pdf (Page 5)

2. The New Active Equalizer

The original 901 introduced the concept of active equaliza

tion to home loudspeaker systems It demonstrated the

fundamental performance advantages of incorporating

equalization as a part of the loudspeaker system design

The 901 Series III realizes additional advaniagcs of active

equalization with three new equalizer features:

• More precise equalization of the audible sound spectrum

made possible by significantly more complex equalization

circuits

• Additional control flexibilily. permitting optimum speaker

performance in a wide range of room positions (see SEC

TION VI).

• Control of response of the speaker beyond the audible

range This precise contouring of response at frequencies

inaudible to the human ear allows the drivers and enclos

ure to be designed for optimum performance character

istics.

3. The Acouslic Matrix"^ Enclosure

The enclosure of the 901 Series III is designed specifically

to work with nine full-range matched drivers in combination

with the active equalizer.

Tiie enclosure Incorporates three Reactive Air Columns (one

for the front driver and one for each group of four drivers on

the rear panels) The purpose of the air columns is to provide

reactiveair loading toreduce the motion required of the driver

cones at extremely low frequencies, thus allowing maximum

efficiency with lowdistorlion.

Additionally, the enclosure partially isolates the acoustic

pressure at each driver from other drivers to permit it to

operate properly through the frequency range where reac

tive loading occurs.

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Bose 901 Series III User Manual Page 5